All language subtitles for 9- Break and Continue

With all the

loops you have learned about in this section, there are two keywords,

break and continue that can change how the loop behaves. In this demo I'm going to

use a while loop. But what you're going to learn applies to all loops

we have learned in this section. So let's start by declaring a variable

called i and initialize it to 0. Now we put this

in a while loop, as long as while is less than or equal to

10, we're going to display i on the console

and then increment it. Save the changes, so

this gives us numbers 0-10. Now sometimes you want to jump

out of a loop for some reason that may happen at run time.

For example, here we can have an if condition

an if statement, with a condition like this.

If i equals 5, we want to jump out of this loop.

That's where we use the break keyword. Now when we save

the changes, see what happens we get the numbers 0

to 4. So at the end of the 5th iteration here we

increment i, now i is 5, so we break out of the loop.

Now let me comment this out and look at the continue keyword.

So I'm going to write another if statement, I want to see

if i is an even number or not. So i,

module is 2, equals 0. If that's the case,

I want to increment i and then continue.

Let's see what happens when we run this code. Save the changes,

we only get the odd numbers, why is that? Alright

let's take a look at an example. So when i becomes 2,

it's an even number, at this point increment i,

i will be 3. Now when the JavaScript engine sees the

continue keyword. It will jump to the beginning of the loop.

And continues it's execution in the next iteration.

At this point i is 3, so this if statement is not executed,

that's why we see i on the console. Now,

in my personal experience, continue is not something you will use that often,

it's one of those old legacy things in JavaScript, I'm only explaining

it here in case you see it in projects you're working on. It's not some

thing that I recommend you to use, it's an ugly way of writing code.

So just to recap with the correct keyword, you jump out of a

loop, and with the continue keyword, we jump to the next iteration.